The sea monk (also monk-fish or monkfish) was a sea creature found off the eastern coast of the Danish island of Zealand, almost certainly in 1546.[1] It was described as a "fish" that looked superficially like a monk, and was mentioned and pictured in the fourth volume of Conrad Gesner's famous Historia Animalium. Gesner also referenced a similar monster found in the Firth of Forth, according to Boethius, and a sighting off the coast of Poland in 1531.

The sea monk was subsequently popularised in Guillaume du Bartas's epic poem La Sepmaine; ou, Creation du monde, where the poet speaks of correspondences between land and sea, mentioning both the "mytred Bishop" and the "cowled Fryer":

"Seas have (as well as skies) Sun, Moon, and Stars;
(As well as ayre) Swallows, and Rooks, and Stares;
(As well as earth) Vines, Roses, Nettles, Millions,
Pinks, Gilliflowers, Mushrooms, and many millions
of other Plants lants (more rare and strange than these)
As very fishes living in the Seas.
And also Rams, Calfs, Horses, Hares, and Hogs,
Wolves, Lions, Urchins, Elephants and Dogs,
Yea, Men and Mayds; and (which I more admire)
The mytred Bishop and the cowled Fryer;
Whereof, examples, (but a few years since)
Were shew'n the Norways, and Polonian Prince."

Steenstrup's comparison of a squid with two drawings of the sea monk from the sixteenth century